The latest Calibre update launched today, and it was interesting enough that I had to try it out. He's added a "Polish" option. New tool: "Polish books" that allows you to perform various automated cleanup actions on EPUB and AZW3 files without doing a full conversion. Polishing books is all about putting the shine of perfection on your ebook files. You can use it to subset embedded fonts, update the metadata in the book files from the metadata in the Calibre library, manipulate the book jacket, etc. More features will be added in the future. To use this tool, go to Preferences >Toolbar and add...

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